Since this post, Achat has enabled members to size the Achat Client screen themselves to suit their PC or Laptop.
Just place your curser on the edge, hold the left click, and drag the Achat game screen to the size you wish.
This also enables the chat box to become bigger too.
Also the in-game chat box can be moved to place where you wish on the game screen. Its default position is bottom left.
If you hold right click and hold your curser between the green send button and the red circled exclamation mark you can the drag the chat box where you want it. To return it to the default position, just click on the white arrow, bottom left.